MOS capacitors have been fabricated by plasma immersion ion implantati
on (PIII) of oxygen or nitrogen ions into p-type (100) silicon wafers.
The processing gas pressure was 3 x 10(-4) Torr for oxygen and 2 x 10
(-4) Torr for nitrogen. After annealing some of the implanted samples
in Ar at 1000 degrees C for 30 min, it was found that about 250 Angstr
om thick insulating layers, with a relative permittivity of epsilon(ox
)=similar to 5 and epsilon(nit)=similar to 7, were synthesized for oxy
gen and nitrogen implants, respectively. (C) 1997 Elsevier Science Ltd
.